S21E10The Simpsons season 21 episode 10: Once Upon a Time in Springfield
Aired 10 January 201022 minRated TV-PG
Where to watch The Simpsons Season 21 in Australia
The Simpsons season 21 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $24.99.
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Availability checked 16 November 2026.
What happens in “Once Upon a Time in Springfield”
Krusty grudgingly adds a pretty, singing cohost named Princess Penelope to his show in order to attract more female viewers. Girls love her, and ratings improve, but Bart and Milhouse want to get the show back to the way it was. The situation gets more complicated when Krusty and Penelope fall in love and decide to get married. Meanwhile, Homer, Lenny, and Carl consider working at a competing nuclear plant when Mr. Burns cuts off their daily doughnut service.
Episode summary: TMDB.
Before you watch
- It is episode 10 of 23 of season 21, so watch episodes 1 to 9 first.
- It runs about 22 minutes.
- Directed by Steven Dean Moore and Matthew Nastuk, written by Matt Selman and Stephanie Gillis.
- TMDB users rate it 6.5 out of 10 (28 votes).
The Simpsons trailer
The official trailer for the series (no preview of this episode has been published).
Play video: The Simpsons trailer
Cast and crew of this episode
- Directors
- Steven Dean MooreMatthew Nastuk
- Writers
- Matt SelmanStephanie Gillis
- Guest stars
- Anne Hathaway as Princess Penelope (voice)Eartha Kitt as Eartha Kitt (voice)Gary Larson as Gary Larson (voice)Jackie Mason as Hyman Krustofsky (voice)Maggie Roswell as Miss Hoover (voice)Pamela Hayden as Milhouse Van Houten / Janey Powell (voice)Maurice LaMarche as Gate Guard #1 (voice)Tress MacNeille as Krusty's Agent / Holly Hippie (voice)
Credits: TMDB.
More from The Simpsons Season 21
Every episode of Season 21The Simpsons episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.